Logger.write('Print Alert Service cannot be started:'+err.Message)

Logger.write(this.ServiceName + ' Has Been Started') ServiceStatus.dwCurrentState = ServiceState.SERVICE_RUNNING Logger.write('In service Driver Name pointer:' + printerInfo.pDriverName+' In service Driver Name:' + Marshal.PtrToStringAnsi(printerInfo.pDriverName)) Logger.write('In service Printer Name pointer:' + printerInfo.pPrinterName+' In service Printer Name:' + Marshal.PtrToStringAnsi(printerInfo.pPrinterName)) SetServiceStatus(this.ServiceHandle, ref serviceStatus) ĪrrayList printerInfoList = printerUtility.getAllLocalPrinterInfo(logger) ServiceStatus.dwCurrentState = ServiceState.SERVICE_START_PENDING Here is services source code: protected override void OnStart(string args) The LogWriter Source code: public class LogWriter Static extern bool EnumPrinters( UInt32 Flags, Throw new Exception('EnumPrinters 2 failure, error code=' + Marshal.GetLastWin32Error()) Throw new Exception('The value of level is out of range') PrinterInfo.Add(Marshal.PtrToStructure(new IntPtr(offset), type)) Result = EnumPrinters(flags, null, level, buffer, needed, out needed, out returned) IntPtr buffer = Marshal.AllocHGlobal((int)needed) Throw new Exception('EnumPrinters 1 failure, error code=' + Marshal.GetLastWin32Error()) If (Marshal.GetLastWin32Error() != Convert.ToUInt32(CredUIReturnCodes.ERROR_INSUFFICIENT_BUFFER))

Result = EnumPrinters(flags, null, level, IntPtr.Zero, 0, out needed, out returned) Private ArrayList enumPrinters(PrinterEnumFlags Flags, UInt32 level) Public ArrayList getAllLocalPrinterInfoV2(PrinterEnumFlags Flags) Logger.write('In dll Driver Name pointer:' + printerInfo.pDriverName+' In dll Driver Name:' + Marshal.PtrToStringAnsi(printerInfo.pDriverName)) Logger.write('In dll Printer Name pointer:' + printerInfo.pPrinterName+' In dll Printer Name:' + Marshal.PtrToStringAnsi(printerInfo.pPrinterName)) Public ArrayList getAllLocalPrinterInfo(LogWriter logger)ĪrrayList printerInfoList = getAllLocalPrinterInfoV2(PrinterEnumFlags.PRINTER_ENUM_LOCAL | PrinterEnumFlags.PRINTER_ENUM_CONNECTIONS) įoreach (PrinterInfoV2 printerInfo in printerInfoList) printerUtility): PRINTER_ENUM_LOCAL = 0x00000002, However, I got nothing when I call the dll in windows services application. I have written a dll which call windows spooler api to get printer name and printer driver name, it works fine in console application.

Windows api enumprintersw